Harry Liedtke (12 October 1882 – 28 April 1945) was a German film actor.
Liedtke was born in Königsberg, East Prussia to a merchant as the seventh out of 12 children. After the death of his father in 1896, he grew up in an orphanage and began a qualification in retail business. By the chance acquaintance of Hans Oberländer, a stage director at Berlin, he started to take stage classes and was first engaged at the municipal Theater of Freiberg, Saxony. In 1908 Liedtke worked at the New German Theatre in New York City and in 1909 at the Deutsches Theater Berlin.
In 1912 Liedtke appeared for the first time in the silent movie Zu spät and from now on usually as a young "Charming Boy" and gentleman. With Ernst Lubitsch he made movies like Das fidele Gefängnis (1917), Die Augen der Mumie Ma (1918), Carmen (1918), Die Austernprinzessin (1919), Madame DuBarry (1919), Sumurun (1920) and Das Weib des Pharao (1921). He also appeared in several crime stories as Stuart Webbs or Joe Deebs written by Joe May. Liedtke was a popular actor in the 1920s and partner of Marlene Dietrich in I Kiss Your Hand, Madame (1929). Liedtke met with less success in sound films, probably due to his advancing age.
From 1920 till 1928, Liedtke was married to the actress Käthe Dorsch.
On 28 April 1945 Liedtke was killed by Red Army soldiers in his house at Bad Saarow-Pieskow east of Berlin together with his third wife Christa Tordy. One of the Russians smashed a bottle over his head when he tried to save his wife Christa Tordy from being raped and murdered.